The National Hockey League has joined together with NBC and the city of Boston to celebrate the start of the 2019 Stanley Cup Final with a free outdoor concert and viewing party at Boston’s City Hall Plaza on Monday. The concert will precede Game 1 between the Bruins and the St. Louis Blues at TD Garden at 8 p.m. The line-up of performers has yet to be announced. The event, which will not require a ticket, will open at 4:30 p.m. followed by musical performances starting at 6 p.m. After the performances, fans are welcome to stay to watch the Bruins-Blues game on video screens. The event will feature food and drinks for sale including beer, wine and a variety of food truck options. Fans can gear up at the Bruins pop-up shop featuring official Stanley Cup Final merchandise. To ensure the safety of all visitors to City Hall Plaza, fans are encouraged to minimize the number of personal items they bring and all carried items are subject to inspection. Boston's City Hall Plaza prohibits the following items: No coolers.No backpacks.No firearms, weapons, sharp objects or fireworks.No glass containers or cans.No Alcoholic beverages or pre-mixed beverages.All liquids will be carried in sealed clear plastic containers not to exceed 2 liters in size.No grilling, propane tanks or open flames.No bicycles will be allowed through the checkpoints.